Wis. Stat. § 49.83
Except as provided under ss. 49.25 and 49.32(6m), (9), (10), and (10m), no person may use or disclose information concerning applicants and recipients of relief funded by a relief block grant, aid to families with dependent children, Wisconsin Works under ss. 49.141 to 49.161, social services, child and spousal support and establishment of paternity and medical support liability services under s. 49.22, or supplemental payments under s. 49.77 for any purpose not connected with the administration of the programs, except that the departments of children and families and health services may disclose, including by transmitting or granting access to electronic data, such information, including social security numbers, to the department of revenue for the sole purposes of administering state taxes, including verifying refundable individual income tax credits, and collecting debts owed to the department of revenue. Any person violating this section may be fined not less than $25 nor more than $500 or imprisoned in the county jail not less than 10 days nor more than one year or both.
Wis. Stat. § 49.83